Is My PC Good Enough?

[DefenderMP]

So I have this PC that I have been construction on PC Parts Picker that is designed with 4k gaming in mind. The only thing I ask is for a second opinion.
http://pcpartpicker.com/p/Kb3Xcf
I'm open to any suggestions. Thank you

PS: I have a second version of this PC that utilizes the Z170 chipset as well
http://pcpartpicker.com/p/4WQnD3

 

[That_Person]

You should be pretty solid with dual 980ti. Maybe do some overclocking with the GPU's to get some better performance.